Overview
The AD7921ARMZ-REEL is a 12-bit, high-speed, low-power successive approximation analog-to-digital converter (ADC) produced by Analog Devices Inc. This component operates from a single power supply ranging from 2.35 V to 5.25 V and features a throughput rate of up to 250 kSPS. It is designed for applications requiring high speed and low power consumption, making it suitable for a variety of electronic systems.
Key Specifications
| Parameter | Value | Unit | Test Conditions/Comments |
|---|---|---|---|
| Conversion Rate | 250 kSPS max | See the Serial Interface section | |
| Conversion Time | 3.2 μs max | 16 SCLK cycles with SCLK at 5 MHz | |
| Track-and-Hold Acquisition Time | 290 ns max | ||
| VDD | 2.35 V to 5.25 V | Minimum and maximum power supply voltage | |
| IDDDigital I/Ps = 0 V or VDD | Normal Mode (Static): 3 mA typ (VDD = 4.75 V to 5.25 V), 1.5 mA typ (VDD = 2.35 V to 3.6 V) | SCLK on or off | |
| IDD Normal Mode (Operational) | 4 mA max (VDD = 4.75 V to 5.25 V), 2 mA max (VDD = 2.35 V to 3.6 V) | fSAMPLE = 250 kSPS | |
| Full Power-Down Mode (Static) | 1 μA max | SCLK on or off, typically 50 nA | |
| Full Power-Down Mode (Dynamic) | 0.4 mA typ | VDD = 5 V |
Key Features
- Fast throughput rate: up to 250 kSPS
- Low power consumption: 4 mW typ at 250 kSPS with 3 V supplies, 13.5 mW typ at 250 kSPS with 5 V supplies
- Wide input bandwidth: can handle input frequencies in excess of 6 MHz
- Flexible power/serial clock speed management
- No pipeline delays
- High speed serial interface: SPI/QSPI/MICROWIRE/DSP compatible
- Standby mode: 1 μA maximum
- Available in 8-lead TSOT and 8-lead MSOP packages
Applications
- Battery-powered systems
- Personal digital assistants
- Medical instruments
- Mobile communications
- Instrumentation and control systems
- Data acquisition systems
- High speed modems
- Optical sensors
Q & A
- What is the maximum throughput rate of the AD7921ARMZ-REEL?
The maximum throughput rate is up to 250 kSPS.
- What is the power supply voltage range for the AD7921ARMZ-REEL?
The power supply voltage range is from 2.35 V to 5.25 V.
- What is the typical power consumption at 250 kSPS with a 3 V supply?
The typical power consumption is 4 mW.
- What types of packages are available for the AD7921ARMZ-REEL?
The component is available in 8-lead TSOT and 8-lead MSOP packages.
- What is the maximum standby current?
The maximum standby current is 1 μA.
- Is the AD7921ARMZ-REEL compatible with high-speed serial interfaces?
Yes, it is compatible with SPI/QSPI/MICROWIRE/DSP interfaces.
- What is the track-and-hold acquisition time?
The track-and-hold acquisition time is 290 ns max.
- What are some typical applications for the AD7921ARMZ-REEL?
Typical applications include battery-powered systems, medical instruments, mobile communications, and data acquisition systems.
- How does the conversion process and data acquisition work?
The conversion process and data acquisition are controlled using CS and the serial clock, allowing the device to interface with microprocessors or DSPs.
- What is the input signal sampling mechanism?
The input signal is sampled on the falling edge of CS, and the conversion is also initiated at this point.
